Comment by PaulHoule
2 days ago
That F1 image is, in my mind, proof of exactly what is wrong with AVIF. If you look closely the beautiful highlights on the car have been erased and replaced with something plausible. Once you see it you can't unsee it and it boggles my mind that people are still using it as an example.
Granted, AVIF performs impressively for, say, a huge hero image for a blog where you're out to create an overall impression and people aren't going to look at it closely. It does not impress me when I am compressing photos I took with my mirrorless and I expect them to look like photos taken with a mirrorless and not cell phone snaps.
Would you be able to circle these highlights? I viewed - https://jakearchibald.com/c/original-CXtAofvc.jpg - https://jakearchibald.com/c/avif-q39-e0-d8-yuv444-ssimu70.4-... at 100% magnification at peeped around for a few minutes but didn't notice anything. Maybe my eyes / monitor is bad...
Oh crap, it's this image
https://jakearchibald.com/2020/avif-has-landed/demos/compare...
I was talking about. He linked another one! Guess people finally realized that one sucks and now they have a new one. I screwed up.
They didn't even have the halo back then!
Look at the fuel cap, the green part of the front wheel, or the vertical frame split behind the fuel cap. AVIF smooth the details out too much.
I'm looking as closely as I'm able, and I don't see what you mean. (I'm not a car guy, or a photo guy.) What do you mean by highlights? What am I looking for? Reflections?
Look between the Eni and ApeCoin logos. In lossless you can see there are lines from what I assume separate pieces assembled together. Next to ApeCoin there's also a round piece in the lossless version which is missing from the AVIF. JPEG XL loses most of these as well though.
That's what I noticed anyway, not a car or photo guy either.
The original is a single photo.
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I agree fwiw. The only one that looks bad to me is jixel at lower qualities.
OH WAIT. I KNOW WHAT'S HAPPENING HERE.
You're looking at it in a browser that doesn't support JPEG XL, so it's falling back to a WASM renderer, and I think it handles resizing differently.
This is totally my bad. I thought I was doing a good thing by adding that fallback renderer, but it isn't identical and it's giving people the wrong impression.
The lossless version is JPEG XL, hence the difference to AVIF.
In Firefox 157.0.1, the right border of the image moves by a pixel or two when I press "hold for lossless" while viewing the AVIF. I think it's the lossy AVIF that's a bit too small.
That's what I'm talking about. JXL support landed in 158.
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by the way, why not convert everything to png for comparisons to avoid browser support issues?
All browsers support AVIF and JPEG XL now. I was hoping to keep their download size benefits.
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I also feel like sometimes the lossless image 'sticks' even after having released the button. Don't know how to reliably test that, though.